* The existing flow is badly broken; every "back" causes the user
to leave the setup flow and therefore have to start from scratch.
This is a very bad user experience, as previously entered data is
lost and must be re-entered.
* The fix corrects these problems, allowing the user to back up
through screens UNTIL the account is successfully created.
* After account creation, the user is returned to the proper screen,
depending on whether we're in "eas flow mode" or not
Bug: 2337511
Change-Id: Ie25ac73dfcd8a1dca36e1b31c75ffb22359840d1
f1efd65a5e